Structural, magnetic and magnetocaloric properties of manganites series with the La0.5Ca0.5−xAgxMnO3 (0.0 ⩽ x ⩽ 0.4) compounds were investigated. Samples were synthesized using the solid state reaction at high temperature and analyzed by XRD data based on the Rietveld refinement technique. Samples with x = 0.0, 0.1, 0.2, 0.3 and 0.4 crystallized in orthorhombic symmetry with Pnma space group. Also, Magnetizations measurements were performed to investigate magnetic properties. Transition from ferromagnetic (FM) to charge ordered antiferromagnetic (CO-AFM) phases at low temperature is observed for Ag-free La0.5Ca0.5MnO3. Compounds with x = 0.2, 0.3 and 0.4, do not exhibit this transition, and only FM metallic phases are observed. The Curie temperature TC increases with increasing Ag amount from 222 K (for x = 0.0) to 264 K (for x = 0.2).While x > 0.2, TC remains substantially constant. Magnetic entropy change (ΔSM) was estimated from isothermal magnetization data. Parent compound (x = 0.0) exhibits both normal (negative ΔSM) and inverse (positive ΔSM) magnetocaloric effects at TC and TCO, respectively. However, all the Ag doped samples show only normal magnetocaloric effect at TC. The Largest MCE occurs for sample with x = 0.4 (ΔSM = 3.27 J kg−1 K−1, ΔH = 5 T) for which largest relative cooling power (RCP = 229.27 J kg−1, ΔH = 5 T) is reached as well.